I just got back from CVS and want to tell you about a great deal I found there. They have the Vitamin brand shampoo and conditioner on sale for Buy One Get One Free AND here is the cool part- the bottles at my store had Try Me Free Tags attached with a mail-in rebate on it. The rebate is good only for 1 bottle but hey, you are already getting the other one free.
Also, you might want to do a quick scan of the rest of the shampoo section. I found a couple other brands recently that also had Try Me Free stickers on them.